Initially cornered 25 5D in Kafka’s work (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

The castle (or rook) is an “initially cornered chess (=entry at 25) piece (=entry at 5D)”, meaning that it starts a game in the corner of the board; The Castle is a 1926 novel by the German-language writer Franz Kafka